Syyncc is a tool for tying together your social networks. Currently it supports Facebook and Google's Buzz, with read-only Google+ and experimental Wordpress support, but plans are to add support for many more networks.
With Syyncc, you can post in one of your networks, and have the post automatically copy to the rest. For example, you can post in Google+ and have that post copy to Facebook, Buzz and to your Wordpress blog. Even better, if anyone comments on your post in any of your networks, the comment will be copied to all the other networks too.
You can visit http://my.syyn.cc/ and get started with it.